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enhancement. Frequency masking occurs when other instruments (particularly cymbals and electric guitars) obscure the important upper harmonic content of your sound. As a result, you find that the EQ settings that were so perfect at home lack definition in a live setting. On the other hand, the stage settings that worked so well sound harsh and/or thin in the absence of other instruments. Frequency enhancement results from cabinet placement and room acoustics. A cabinet placed on the floor will have the lower frequencies boosted by about 3 db. Placement against a wall adds another 3 db. A corner adds 3 db more. Consequently you may find a surprising boominess to your sound. Certain qualities in the room itself can also enhance the lower frequencies, further contributing to this problem. Frequently this effect is more noticeable in the audience than it is on stage. Compensating for it may result in a stage sound that may seem a little thin. However the sound is actually quite full out in front.
used to connect from the headphone jack of the WT-550 to an unbalanced input of a standard power amplifier. This will provided a signal that is post EQ and master volume controls, allowing the entire system to be controlled from the WT -550.
Using the WT -550 Without Speakers
This amplifier is designed to be used safely with headphones only,. Without the loud speaker plugged in. No harm will result from using the amplifier in this fashion. This allows the use of the unit for practice with headphones and as a preamplifier with other amplifiers.
MAINTENANCE
Your Eden amplifier has been designed to require minimal routine maintenance. Attention to the following areas will ensure optimum performance of your amplifier.
Contact Point Cleaning � One of the
weakest links in most bass amplification systems are the solderless connection points where instruments, speaker cabinets, effects, and other devices are connected to the amplifier. (The most vulnerable of these types of connection is the jack on your instrument). In addition to contamination from airborne pollutants, these points are frequently assaulted by connectors that have picked up debris from dirty stages, cases, etc. These points should be cleaned regularly with a cotton swab soaked in denatured alcohol or a commercially available deoxidant. Frequent cleaning of the plugs on your cords is also recommended.
OTHER CONSIDERATIONS
Suggested Speaker Systems � Your
speaker system, should be chosen to accommodate the characteristics of your amplifier and your predominant application. If you will only be using one cabinet, a 4 Ohm model will draw the most current from your amplifier. If you will generally be using two cabinets, they should be 8 Ohm models so their combined impedance will be 4 ohms. If you are uncertain about your future needs always go with the 8 Ohm speaker option so that you can add another speaker later if you need to. Common Eden David Series cabinets chosen to accompany the WT-400 include: (1) (1) (2) (1) (1) D115XLT or D210XLT 4 Ohm cabinet D410XLT 4 Ohm cabinet D210T or D210XLT 8 Ohm cabinets D410T or D212XLT 4 Ohm cabinet D115XL & (1) D210T 8 Ohm cabinet
Dust Removal � You should periodically
inspect the ventilation openings on the top and sides of the unit to ensure that they have not become blocked by accumulated dust. Vacuum the openings to remove any dust buildup.
Tube Replacement � Tube life varies Headphone Jack as Line Driver � On
some occasions (such as high-volume or outdoor situations) it may be desirable to use the WT-550 along with an additional power amplifier and added cabinets. A standard shielded instrument cable may be greatly depending upon use, vibration, and tube quality. It is uncommon for a tube to last less than a year in our circuits. Tube life of several years is not at all uncommon. Symptoms of tube failure include signal loss, distortion, and increased noise. The tube is
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